Package gaiasky.util.coord

Class NslSun

java.lang.Object

gaiasky.util.coord.NslSun

public class NslSun
extends Object

Constructor Summary

Constructors

Constructor	Description
NslSun()	Constructor

Method Summary

Modifier and Type	Method	Description
double	angleBase(double x, int nRev)	Puts an angle in the base interval [ 0, nRev*2*PI )
Vector3d	getSolarDirection(Vector3d out)
double	getSolarLongitude()
double	getSolarLongitudeDot()
double	getSolarLongitudeMod4Pi()
QuaternionDouble	heliotropicToQuaternion(long t, double xi, double nu, double Omega)	Method to convert heliotropic angles to quaternion
void	setTime(double julianDate)	Calculate all fields for a given julian date.
void	setTime(long tNs)	Calculate all fields for a given time

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NslSun

public NslSun()

Constructor

Method Details

setTime

public void setTime(double julianDate)

Calculate all fields for a given julian date.

Parameters:

julianDate - The julian date.

setTime

public void setTime(long tNs)

Calculate all fields for a given time

Author: F. Mignard

Parameters:

tNs - time in [ns] since the time origin

getSolarLongitude

public double getSolarLongitude()

Returns:

solar longitude in [rad]

getSolarLongitudeMod4Pi

public double getSolarLongitudeMod4Pi()

Returns:

solar longitude in [rad], modulo 4*PI

getSolarLongitudeDot

public double getSolarLongitudeDot()

Returns:

time derivative of solar longitude in [rad/day]

getSolarDirection

public Vector3d getSolarDirection(Vector3d out)

Parameters:

out - The output vector.

Returns:

The output vector containing the solar direction as a unit 3-vector in BCRS.

heliotropicToQuaternion

public QuaternionDouble heliotropicToQuaternion(long t,
 double xi,
 double nu,
 double Omega)

Method to convert heliotropic angles to quaternion

Parameters:

t - time [ns]

xi - revolving angle (solar aspect angle) [rad]

nu - revolving phase [rad]

Omega - spin phase [rad]

Returns:

attitude quaternion

angleBase

public double angleBase(double x,
 int nRev)

Puts an angle in the base interval [ 0, nRev*2*PI )

Parameters:

x - angle [rad]

nRev - number of revolutions in base interval

Returns:

angle in base interval [rad]